Instructions - how to make degree-day mapsNew Version 4.5 - improved resolution, better subregion support, network selection, and GIS data downloads
1. Be sure to read the
documentation pages
before starting
2. Select calculator options (similar to a site-only calculator), and mapping options (particularly Region)
3. Note that the "Subregion" option is only valid for non-New England states (is not valid for ME, VT, NH, CT,
RI, NJ, or DL)
4. Note that the "Resolution" option should only be used for small regions and states, and slows down processing.
This option is experimental and may not provide an improved map. Use with caution.
5. The new "Network Selection" option allows: a) faster processing "include selected networks (fewest stations)",
b) fewer "bullseye anomalies" (fewer mis-aligned weather stations, c) allows for the possible need
for greater detail offerred by picking "all networks". Default currently set for fewest stations,
which currently is set to the following networks: METAR (ASOS), AGRIMET, HYDROMET, RAWS,
AGWEATHERNET, CIMIS, PESTCAST, and MILTON-FREEWATER ADCON.
6. Click on MAKE MAP button - typically takes 40+ seconds for a western state
if you get an error, try:
a) using a different web browser (Firefox recommended),
b) again after a few minutes, or
c) letting us know about the error (see email link below)
7. Conditions not currently supported include:
a) degrees Celsius (only Fahrenheit is supported)
b) calculations that need data in the future
c) for eastern states - years before 2005
8. When map is finished, the GRASSLinks button will appear. Click on this to see and interact with the map
(ca. 4-12 seconds additional wait time)
9. A separate legend window will also open (requires javascript support)
10. Optional - download zipped GIS data (arc ascii format)